> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mellea.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# mellea.plugins.hooks.session

> Session lifecycle hook payloads.

export const SidebarFix = () => <script dangerouslySetInnerHTML={{
  __html: `
        (function () {
          const INTERVAL_MS = 500;

          const upgradeSidebar = () => {
            const links = document.querySelectorAll('a[href^="#"]');

            links.forEach((link) => {
              if (link.dataset.badged === "true") return;

              const rawText = (link.textContent || "").trim();

              // ========== FUNC ==========
              if (rawText.startsWith("FUNC ")) {
                const label = rawText.replace(/^FUNC\\s+/, "").trim();

                while (link.firstChild) link.removeChild(link.firstChild);

                // 👉 Make the whole link a single flex row & prevent wrapping
                link.style.display = "flex";
                link.style.alignItems = "center";
                link.style.whiteSpace = "nowrap";
                link.style.columnGap = "0.5rem";

                const badge = document.createElement("span");
                badge.style.marginRight = "0.5rem";
                badge.style.display = "inline-flex";
                badge.style.alignItems = "center";
                badge.style.borderRadius = "9999px";
                badge.style.padding = "0rem 0.6rem";
                badge.style.fontSize = "0.5rem";
                badge.style.fontWeight = "700";
                badge.style.letterSpacing = "0.05em";
                badge.style.backgroundColor = "rgba(48, 100, 227, 0.20)";
                badge.style.color = "#1D4ED8";

                badge.textContent = "FUNC";

                link.appendChild(badge);
                link.appendChild(document.createTextNode(label));
                link.dataset.badged = "true";
                return;
              }

              // ========== CLASS ==========
              if (rawText.startsWith("CLASS ")) {
                const label = rawText.replace(/^CLASS\\s+/, "").trim();

                while (link.firstChild) link.removeChild(link.firstChild);

                // 👉 Same flex / nowrap treatment for class links
                link.style.display = "flex";
                link.style.alignItems = "center";
                link.style.whiteSpace = "nowrap";
                link.style.columnGap = "0.5rem";

                const badge = document.createElement("span");
                badge.style.marginRight = "0.5rem";
                badge.style.display = "inline-flex";
                badge.style.alignItems = "center";
                badge.style.borderRadius = "9999px";
                badge.style.padding = "0rem 0.6rem";
                badge.style.fontSize = "0.5rem";
                badge.style.fontWeight = "700";
                badge.style.letterSpacing = "0.05em";
                badge.style.backgroundColor = "rgba(74, 222, 128, 0.20)";
                badge.style.color = "#15803D";

                badge.textContent = "CLASS";

                link.appendChild(badge);
                link.appendChild(document.createTextNode(label));
                link.dataset.badged = "true";
                return;
              }
            });
          };

          upgradeSidebar();
          setInterval(upgradeSidebar, INTERVAL_MS);
        })();
      `
}} />;

<SidebarFix />

Session lifecycle hook payloads.

## Classes

<div className="w-full h-px bg-gray-200 dark:bg-gray-700 my-4" />

### <span className="ml-2 inline-flex items-center rounded-full px-2 py-1 text-[0.7rem] font-bold tracking-wide bg-[#4ADE8033]/20 text-[#15803D]">CLASS</span> `SessionPreInitPayload` <sup><a href="https://github.com/generative-computing/mellea/blob/v0.6.0/mellea/plugins/hooks/session.py#L13" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Payload for `session_pre_init` — before backend initialization.

**Attributes:**

* `backend_name`: Name of the backend (e.g. `"ollama"`, `"openai"`).
* `model_id`: Model identifier string (writable).
* `model_options`: Optional dict of model options like temperature, max\_tokens (writable).
* `context_type`: Class name of the context being used (e.g. `"SimpleContext"`).

<div className="w-full h-px bg-gray-200 dark:bg-gray-700 my-4" />

### <span className="ml-2 inline-flex items-center rounded-full px-2 py-1 text-[0.7rem] font-bold tracking-wide bg-[#4ADE8033]/20 text-[#15803D]">CLASS</span> `SessionPostInitPayload` <sup><a href="https://github.com/generative-computing/mellea/blob/v0.6.0/mellea/plugins/hooks/session.py#L29" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Payload for `session_post_init` — after session is fully initialized.

**Attributes:**

* `session_id`: UUID string identifying this session.
* `model_id`: Model identifier used by the backend (e.g. `"granite4.1\:3b"`).
* `context`: The initial [`Context`](../../core/base#class-context) instance for this session.

<div className="w-full h-px bg-gray-200 dark:bg-gray-700 my-4" />

### <span className="ml-2 inline-flex items-center rounded-full px-2 py-1 text-[0.7rem] font-bold tracking-wide bg-[#4ADE8033]/20 text-[#15803D]">CLASS</span> `SessionResetPayload` <sup><a href="https://github.com/generative-computing/mellea/blob/v0.6.0/mellea/plugins/hooks/session.py#L43" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Payload for `session_reset` — when session context is reset.

**Attributes:**

* `previous_context`: The [`Context`](../../core/base#class-context) that is about to be discarded (observe-only).

<div className="w-full h-px bg-gray-200 dark:bg-gray-700 my-4" />

### <span className="ml-2 inline-flex items-center rounded-full px-2 py-1 text-[0.7rem] font-bold tracking-wide bg-[#4ADE8033]/20 text-[#15803D]">CLASS</span> `SessionCleanupPayload` <sup><a href="https://github.com/generative-computing/mellea/blob/v0.6.0/mellea/plugins/hooks/session.py#L54" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Payload for `session_cleanup` — before session cleanup/teardown.

**Attributes:**

* `context`: The [`Context`](../../core/base#class-context) at the time of cleanup (observe-only).
* `interaction_count`: Number of items in the context at cleanup time.

<div className="w-full h-px bg-gray-200 dark:bg-gray-700 my-4" />